Manufacture of cellulose derivatives.



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MANUFACTURE OF CELLULOSE DERIVATIVES.

lto Drawing.

To all whom it may concern Be it known that We, 'Josnrn Kon'rsonn'r, of24 Quai Claude Bernard, Lyon, a citizen of the Swiss Republic, and MAXTHnU-MANN, of St. Fons, Rhone, France, a citizen of the French Republic,have invented certain new and useful lmprovements in or Relating to theManufacture of Cellulose Derivatives, of which the following is aspecification.

The present invention has for its subject a process for the manufactureof new cellulose derivatives. This process consists in causing anhydridsof the fatty series to act, W1th or Without a catalyzer, upon celluloseor its derivatives in presence of trioxymethylene or formaldehyde andmore generally in presence of aldehydes of the fatty series, theirpolymers or derivatives.

T e process allows of obtaining products Which '1n appro ri'a-tesolvents give soluoth viscous and clear and preparation of substitutesfor celluloid, caoutchouc, etc.

. We give below, by way of example, one practical form of the process inwhich the method of working described in the specification of U. S.American a plication for patent filed 18 June, 1914, S. 0. 845,856, isadopted.

10 parts of cellulose are tact with a mixture of:

60 parts glacial aceticacid, 4 parts acetic anhydrid, 0.5 parts 100%sulfuric acid, 1 part trioxymethylene.

brought into con- The cellulose is rapidly attacked, loses its" textureand forms with the liquid mixtures a very fluid mass. The mass ismaintained at a temperature of about 30 C. for some hours, and then 21parts of acetic anhydrid are added.'

The acetylation proceeds very rapidly; the cellulose modified ,by thepreliminary treatment dissolves very quickly, becoming transformed intoan extremely viscous tions.

0n precipitating with water a product is obtained which in the usualsolvents of France,

.catalyzer,

product capable of giving very clear solu Specification of LettersPatent. Patented Feb. 2% 191i '3' Application filed June is, new. Serialin. 3 5,071.

cellulose acetate gives solutions having the properties above indicated.

If, instead of precipitating the acetylation product direct, onesaponifiessame partially in the solution before precipitating, newdeacetylation products are readily obtained, some of which are solublein acetone.

It, is evident that the invention is not limited to the above example,nor to the esterification of the cellulose in two phases. The inve'tionin fact. is applicable to any processo esterification of cellulose andits derivatives. 7

What I claim and desire to mcure by Letters Patent is 1. Process for themanufacture of cellulose derivatives by the action of anhydrids of thefatty series, with a catalyzer, upon cellulose or its derivatives, saidprocess being characterized in that the reaction is performed in resenceof trioxymethylene orformaldehydh.

2. Process for lulose derivative, comprising lulose or a cellulosederivative to treatment with an anhydrid of the fatty acid series inpresence. of sulfuric acid and of trioxymeth lene.-

3. recess for the manufacture of a cel lulose derivative, comprisingsubjectingceh lulose or a cellulose derivatlve to a preliminaivtreatment with an acid of the fatty aci series and an anhydrid of thefatty acid series in presence of a catalyzer and trioxythe manufactureof a celmethylene andsubjecting the resulting mass a further quantity ofto esterification with anhydrid of the fattyacid series.

4. Process for the manufacture of a cellulose derivative, comprisingsubjectin cellulose or a cellulose derivative to a pr im nary treatmentwith an acid of the fatty acid series and an anhydrid of the fatty acidseries in presence of formaldehyde and a and subjecting the resultingmass to esterification with a further quantity of anhydrid of thefattyacid series;

5. Process for the manufacture of a cellulose derivative, comprisingsubjecting cellulose or a cellulose derivative to treatment with aceticacid and acetic anhydrid in presenoe of trioxymethylene and a catalyzer;

6. Process for the manufacture of a celsubjecting cellulose" derivative,comprising subjecting eel lulose or a cellulose derivative to treatmentwith glacial acetic acid and acetic anhydrid in presence oftrioxymethylene and sulfuric i a I 7 Process for the manufacture of acellulose derivative, comprising subjecting cellulose or a cellulosederivative to a preliminary treatment with acetic acid, and aceticanhydrid, in presence of trioxymethylene and a'catalyzer andsubjecting'jthe resulting mass to acetylating' treatment with a fur;ther quantity of acetic'anhydrid. y 8. Process for the manufacture of acellulose derivative, comprising subjecting cellulose or a cellulosederivative to treatment with an acid of the fatty acid series-and ananhydrid of the fatty acid series and'a catalyzer, in presence oftrioxymethyl'en'e and precipitating the resulting cellulose derivat-1ve.v

9. Pr0cess .for the manufacture of a cellulose derivative,icomprisingsubjecting cellulose or cellulose derivative to treatment with an acidof the fatty acid'series and an anhydrid of the fatty acid series and acatalyzer in presence of trioxymethylene partially saponifying the.resulting cellulose derivative in solution and precipitating thepartially saponified derivative.

3 10. Process for the manufacture of a cellulose derivative, comprisingsubjecting celluloseor a cellulose derivative to treatment a with anacid of the fatty acid series and an anhydrid of the fatty acid seriesand a catalyz er, in presence of formaldehyde and precipitating theresulting cellulose derivative.

11. Process for the manufactureof a cellulose derivative,- comprisingsubjecting cel- I lulose or a cellulose derivative to treatment with anacid of the fatty acid series and an anhy dridof the fatty acid seriesand acatalyzer in presence of formaldehyde partially saponifying theresulting cellulose derivative in solutionand precipitating the par- -'1

